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<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>引入方式三</title>
    <!--外部样式-->
    <link rel="stylesheet" href="css/04外部样式.css"/>
</head>
<body>
    <div>div1</div>
    <div>div2</div>
</body>
</html>